Transmitter-arm.



No. 729,184. PATENTBD MAY 26, 1903.

W. KAISLING. TRANSMITTER ARM.

' APPLIOATION TILED DEC. 8, 1902. NO MODEL.

UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

WILLIAM KAISLING, OF CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SWITCH-BOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

TRANSMITTER-ARM.

SPECIFICATION forming part of Letters Patent No. 729,184, dated May 26,1903.

Application filed December 8, 1902. $erialNo.134,249. (No model) To allwhom it may concern:

Be it known that I, WILLIAM KAISLING, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Transmitter-Arms, ofwhich the following is a specification.

My invention relates to improvements in transmitter-arms, my objectbeing to provide an arm that will accomplish practically the sameresults as ordinary arms in so far as the up-and-down adjustment toaccommodate the instrument to persons of different heights is concerned,but with an economy of room not obtainable in the ordinary arm, andwhich saving in space particularly adapts my invention to use inlocations, such as the rooms of hotels, where by reason of the limitedavailable space and the further fact that the instrument must almostinvariably be affixed to the wall of the room it is inexpedient to havethe transmitter project an undue dis tance from the face'of thetelephone-box or other support.

A further object isto provide such a short arm with means to entirelyconceal the transmitter cord or cords, so that although the instrumentsare designed to be located in places where an exceptional opportunityfor tamper ing with the same by unauthorized persons is provided thereis Very little opportunity for their derangement.

Still another object is to provide a firm and reliable mounting for anarm which may be conveniently and neatly applied to a telephone-box orother support and without unnecessary complication.

To the accomplishment of these and such other objects as may hereinafterappear, the invention comprises the construction and featureshereinafter'described, and particularly pointed out in the appendedclaims, reference being had to the accompanying drawings, forming a partof this specification, in which the same reference characters indicatelike parts throughout the several views, and

. in which ing the arm in perspective. Fig. 2 is a detailed perspectiveview of the arm proper. Fig. 3 is a perspective view of the rear face ofthe base-plate. Fig. 4 is a detailed view of the pivot-pin. Fig. 5 is ahorizontal sectional View throughthe center line of the pivot and arm,and Fig. 6 is a vertical section through the center of the base plate.

In the figures, 2 indicates the usual box of an ordinary hotel set inwhich the usual switch-hook 3 is pivoted and upon which the receiver isnormally hung to change the circuits of the set from talking tosignaling position, and vice versa. The cover or door 4 of the box issecured by the hinges 5 and 6 to the edge of the box 2, and when closedit is locked bya suitable'scre'w or other locking device 7. In Fig. 1this cover is shown partiallyopen, so that the transmitter-arm and itsbase-plate are seen in perspective.

which the inner end of the arm 8 isinserted and through which, as wellas through the said arm, the pivot-pin 11 extends. The arm 8 is recessedconcentrically with its pivot-aperture upon each side, as at 12, toreceive the metallic spring-washers 13 or other friction devices tocause a sufficient binding between the sides of the arm and the earsorlugs 10 10, so that the arm will remain in any position to which it isadjusted.

The door 4 or other support to which the arm may be attached is providedwith a depressionin this case in the form of an aperture 14-into whichthe rearwardly-extending ears or lugs 1O 10 project. The body of thebase-plate 9 is sufficiently large to extend beyond the edge of theaperture 14 and to thereby cover or conceal the same. It forms, in

fact, an escutcheon for the hole 14, and thus 5 combines a neatappearance with a firm and reliable mechanical structure.

The aperture 16' through the body portion of the plate 9 and throughwhich the pivoted arm 8 extends is provided with a wide mouth oropening, preferably formed by the flaring edges 17 17 of the upper andlower ends of the said opening or slot 16, as shown in Fig.

6, and which may be curved also,asindicated,

to conform to the exterior curvature of the arm 8. This constructionpermits the arm to be vertically vibrated through an extremelywide angleconsidering the rearward location of the pivot, whereby the transmitter,which, as hereinafter explained, is carried upon the outer end of thearm, may be adjusted to the heights of different persons as readily andto practically the same extent as though an arm of the ordinary typewere employed. The location of the pivot 11 is back of the face of thebase-plate 9 and even back of the face of the door 4, thus gainingconsiderable room with respect to the projection of the transmitter fromthe face of the telephone-box.

As shown in Figs. 1 and 5, the arm is provided with a flat outer end 18,adapted to receive the corresponding portion of the transmitter 19,which is secured thereon by means ofsuitablescrews20,passingthroughawasher 21, the rear wall of thetransmitter-casing,

.and into threaded apertures 22, formed in the said forward end 18 ofthe arm. These serve to readily secure the transmitter in position uponthe outer end of the arm 8. It will be understood that this end of thearm may be formed to receive any type of transmitter.

For the sake of concealing the transmittercords, so that no harm maycome to them, and for the sake of a good appearance the arm is providedwith a longitudinal bore 23, through which the transmitter-cords 24extend. These cords are preferably of the usual insulated type employedin this class of instruments, and one of them is preferably secured, asshown in Fig. 5, to one of the screws 20, whereby that side of thecircuit is established with the transmitter-shell,and is thencecontinued through the diaphragm or in any other manner to one electrodeof the transmitter. The other conductor 24, extending through thetransmitter-arm, is designed to be suitably secured to the otherelectrode of the transmitter without 'being electrically connectedwiththetransmittercasingorarm. As shown, these wires may pass backthrough the arm,.one on either side of the pivot-pin 11, and be suitablyconnected in the electric circuit. It will be obvious that but a singlewire may beemployed; butitis preferredto use both, as shown. Their innerends, as shown in Fig. 1, are secured the one to a metal strip 25,carried upon-the inner side of the cover 4: and electrically connectedwith the hinge 5, while the other is similarly connected with a likestrip 26, extending to the hinge 6, wherep by the transmitter isconveniently connected in the electric circuit of the set.

Figs. 5 and without departing from the scope or principle thereof; but,

Having thus pointed out one commercial form of the invention and themanner of carrying the same into practical effect, what I claim, anddesire to secure by Letters Patent, is

l. The combination withasupporting member having a depression in itsouter face, of a base-plate having a substantially flat outer face, saidplate being secured to said member over said depression and serving asan escutcheon to cover and conceal the same, a short transmitter-armpivoted at its inner end directly to said base-plate back of its outerface whereby said base-plate and arm may be applied to or removed fromsaid supporting member as a whole, said arm being arranged to receiveand carry a telephone-transmitter at its outer end, substantially asdescribed.

2. The combination with a short transmitter-arm, of a base-plate havinga rearwardlyextending part, the arm being pivoted to saidrearwardly-extending part, substantially as described.

3. The combination with a transmitter-arm, of a base-plate havingrearwardly-extending ears or lugs, the said arm being pivoted betweensaid ears or lugs, substantially as described.

4. The combination with asupporting member having a depressiontherein,of a baseplate provided with a part extending rearwardly into saiddepression, and a transmit ter-arm pivoted to said rearwardly-extendingpart, substantially as described.

5. The combination with a supporting mem- I ber having a depressiontherein, of a baseplate provided with a part extending rearwardly intosaid depression, and a transmitter-arm pivoted to'saidrearwardly-extending part, said base-plate serving to also cover andconceal the depression, substantially as described.

6. The combination with asupporting member having an aperture therein,of a baseplate secured to the face of said member and having lugsextending rearwardly into said aperture, said base plate having awidemouthed opening between said lugs, and a short transmitter-armextending through said opening and pivoted between said lugs,substantially as described,

7. The combination with asupporting member having an aperture therein,of a baseplate secured to the face of said member and having lugsextending rearwardly into said aperture, said base plate having aWidemouthed opening between said lugs, and a transmitter-arm extendingthrough said opening and pivoted between said lugs, the said plateserving also to cover and conceal the said aperture and the wide-mouthedopening permitting a wide-angled movement of the arm, substantially asdescribed.

8. The combination with a base-plate having an opening andrearwardly-extending lu gs I at the sides of the opening, atransmitter-arm extending through said opening and pivoted between saidlugs, and means to cause the arm to frictionally engage the said lugs,whereby the arm remains in any position to which it is adjusted,substantially as described 9. The combination with a base-plate havingan opening and rearwardly-extending lugs at the sides of the opening, ashort transmit-.

ter-arm extending through said opening and pivoted between said lugs,and a frictionwasher between the arm and one of the lugs, whereby thearm remains in any position to which it is adjusted, substantially asdescribed.

10. The combination with a base-plate hav- 7 ing an opening andrearwardly-extending lugs at the sides of the opening, a short transmitter-arm extending through said opening and pivoted between said lugs,and friction-wash ers between the arm and the lugs, whereby the armremains in any position to which it is adjusted, substantially asdescribed.

11. The combination with a base-plate hav ing an opening andrearwardly-extending lugs at the sides of the opening, a transmitter-armextending through said opening and pivoted between said lugs, thesaidarm having a recess formed on each side opposite the lug, andfriction-washers carried in said recesses, substantially as described.

12. The combination with a base-plate having an opening andrearwardly-extendinglugs at the sides of the opening, a transmitter-armextending through said opening and pivoted between said lugs, the saidarm having a recess formed on each side opposite the lug, and metallicspring friction-washers carried one in each said recess, substantiallyas described.

13. The combination with a supporting member having a depression in itsouter face, of a base-plate having a substantially flat outer face, saidplate being secured to said member over said depression and serving asan escutcheon to cover and conceal the same, a short transmitter-armpivoted at its inner end directly to said base-plate back of its outerface whereby said base-plate and arm may be applied to or removed fromsaid supporting member as a whole, said arm being arranged to receiveand carry a telephonetransmitter at its outer end and being hollow topermit the passage therethrough to the rear of said plate of theconductor cord or cords whereby they are concealed from view,substantially as described.

14. The combination with a supporting member having an aperture, of abase-plate having pivot-lugs extending rearwardly into said aperture, atransmitter arm passing through an aperture in said plate and pivotedbetween said lugs, said arm having a longitudinal bore for the passageof the transmitter cord or cords whereby they are entirely concealed andare brought out in the rear of said member for ready connection in theelectric circuit, substantially as described.

15. The combination with a supporting member having an aperturetherethrough, of a base-plate secured to the face of said member andhaving pivot-lugs extending rearwardly into said aperture, said platealso having an opening between said lugs, a transmitter-arm extendingthrough said opening and pivoted between said lugs, said arm having alongitudinal bore, a transmitter cord or cords passing through said boreto the rear of said member, and a fixed circuit conductor or conductorsmounted upon the inside of said member and with which the said cord orcords are connected, the arrangement and connection being such as not toimpede the adjustment of the arm to difierent angles, substantially asdescribed.

16. In a telephone-box, the combination with a hinged door, of abase-plate affixed to the outside thereof, and havingrearwardlyextending pivot-lugs projecting into an aperture in the same,a short transmitter-arm'pivoted to said lugs, saidarm being hollow,transmitter-cords extending through said arm and to the inside of thesaid door, and fixed circuit-conductors secured to the inside of saiddoor and connecting with the hinges thereof at one end and with the saidtransmitter-cords at the other, substantially as described.

17. The combination with a base-plate having lugs extending rearwardlyfrom its inner face, of a transmitter-arm passing through an aperture insaid plate and between said lugs, and a pivot for said arm carried bysaid lugs in the rear of said inner face, substantially as described.

18. The combination with a base-plate having rearwardly-extending lugsand a wide-angled slot between said lugs, a transmitter-arm having itsinner end passing through said opening and between said lugs, apivot-pin passing through said lugs in the rear of the inner face ofsaid plate and through said arm, and a supporting member to which saidplate is secured, said member having a depression into which said lugsextend, the side walls of the depression preventing the working out ofsaid pin, substantially as described.

19. The combination with a supporting member having an aperture therein,of a baseplate having a wide-angled opening therein and lugs upon itsrear face extending into said aperture, a short transmitter-arm havingan enlarged and transversely-flattened outer end to which atelephone-transmitter is adapted to be secured, the inner end of saidarm being flattened and extending through said opening and between saidlugs, frictionwashers carried in recesses in its opposite fiattenedsides and engaging the inner faces of said lugs; a pivot-pin passingthrough said lugs, the said inner end of the arm and the washers; andscrews passing through said member and into the rear-face of said plateto secure the same to the said member, the said arm havingalongitudinalbore from end to end to receive the conductor-cords, substantially asdescribed.

20. The combination with a supporting member having an aperture therein,of a baseplate secured to one face of saidmember and having a partprojecting into said aperture, atransmitter-arm pivoted at its rear endto said part projecting into the said aperture and adapted to carry atelephone-transmitter at its free end, and meansto secure said baseplateto said supporting member whereby said arm is also secured to the saidmember, substantially as described.

Signed by me at Chicago, county of Cook, State of Illinois, this 6th dayof December,

WILLIAM KAISLING.

Witnesses:

FRANCIS E. JOHNSON, GAZELLE BEDER.

